Answered How do I get Value of a Tpl Chunk Placeholder Set by getChunk()

     $xZ=1;
        if ($xZ==1) {    
            $chunkParams = array(
                //mrhaw
                'org' => $url2, 
                'url' => $url,
                'alt' => $data->altTag,
                'link' => $data->linkField,
                'width' => $data->targetWidth,
                'height' => $data->targetHeight
            );
            //mrhaw
            //return $this->modx->getChunk($opts['outputChunk'], $chunkParams);
            return $this->modx->getChunk('imagePlus', $chunkParams);
        } else {
            // Otherwise return raw url
            return $url;
        }

    }

    <li>
     <a href="[[+url]]" title="[[+alt]]">
      <img src="[[+org]]" alt="[[+alt]]">
     </a>
     <h4>[[+alt]]</h4>
    </li>

if (main resource)
return $this->modx->getChunk('imagePlus', $chunkParams);
else
return $this->modx->getChunk('imagePlusEXT', $chunkParams);